Made call description to not explicitely state PC increment

Every instruction which uses the PC implicitely uses to incremented
PC (pointed at next instruction). Because the PC is incremented during
a fetch, this requires the minimum amount of work and doesn't require
extra math to store the return address.
Merge branch 'c16' of https://github.com/CS350C-Fall-2014/instruction-set into c16x

Conflicts:
	instructions.txt
Reverted to original type names